class Person {
  constructor(name) {
    this.name = name;
  }
  show() {
    return `后盾人会员: ${this.name}`;
  }
}
class User extends Person {
  constructor(name) {
    super(name);
  }
  run() {
    console.log('run...')
    
    return super.show();
  }
}
const xj = new User("向军");
console.log(xj.run());
console.log(xj.show());
console.dir(xj)
